Chief Bryfonski said there was no connection between victims and the suspects charged with the assault on the Quesadas.

Police said Eduardo Quesada had been stabbed multiple times with a screwdriver, resulting in facial fractures, lacerations and bleeding on the brain. Sonia Quesada had been sexually and physically assaulted multiple times, resulting in the loss of eyesight in her left eye, police said.

Chief John Bryfonski said the injuries the couple suffered were so severe that the two were unable to help detectives in the early stages of the investigation.

Sonia Quesada later died in what police called an unrelated incident on Jan. 7 at her mother-in-law's condo in Bedford.

Bryfonski said police eventually developed a lead that led them to identify Normil as a suspect. Earlier this week, Fish and Game Department dive teams recovered evidence from a brook in Milford.

Police said Normil has been in custody in Massachusetts in an unrelated case since December. Normil was charged in February by Methuen, Mass., police with home invasion, assault and battery with a dangerous weapon, and larceny over $250.

Officials said another suspect has been identified, but they said that suspect is being handled as a federal matter, and no further details were released.